In this image posted on the Twitter page of Syria’s al-Qaida-linked Nusra Front on Friday, April 1, 2016, shows fighters from al-Qaida’s branch in Syria, the Nusra Front, getting ready to attack the northern village of al-Ais in Aleppo province, Syria.

The spokesman for Al-Qaeda’s Syrian affiliate, Al-Nusra Front, his son and 20 other militants were killed in air strikes Sunday in the northeast of the country, a monitor said.

“Abu Firas al-Suri, his son and at least 20 jihadists of Al-Nusra and Jund al-Aqsa and jihadists from Uzbekistan were killed in strikes on positions in Idlib province,” Syrian Observatory for Human Rights chief Rami Abdel Rahman told AFP.

It was not immediately clear if the raids were carried out by Syrian regime warplanes or their Russian allies.

Abdel Rahman said Suri was meeting with other leading militants in Kafar Jales when the raids struck and that two other Al-Nusra and Jund al-Aqsa targets were also attacked.

A temporary ceasefire between government forces and rebels has largely held since February 27, but it does not cover Al-Nusra Front and ISIS.

On Wednesday, a drone strike near ISIS’s de facto Syrian capital Raqa killed a jihadist commander, according to the Observatory, in the latest in a series of blows to the militants in recent weeks.

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